/*
 * Copyright 2011,2012 Metamarkets Group Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.metamx.common.collect;

import java.util.HashMap;

// Can't find a good way to abstract over which aggregator representation is used,
// so I just pick Double/MutableDouble.
public class AggregatingMap<K> extends HashMap<K, Double>
{
  public void add(K k, double n)
  {
    final Double value = get(k);

    if (value == null) {
      put(k, n);
      return;
    }

    put(k, value + n);
  }
}
